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(A) Production steps for realizing an SPR sensor in a D-shaped POF with an MIP receptor; 1, 2, 3 correspond to the production steps. (B) SPR spectra obtained at different concentrations of PFOA in water solution (0–4 ppb) by an SPR–POF–MIP sensor. Inset: zoom of the resonance wavelengths. Reprinted from [102].
